Widest tire on Jake the Snake

Anyone know what's the widest tire I can put on my (09) Jake the Snake with stock carbon fork? I'm currently riding on Kenda SB8 (35C) and on occasion I'll slap on a set of Kommandos also in 35C. After CX season is over I want to stuff the widest tire possible for some trail riding. I don't mind clipping off a bit of side knobbies if this will get them to fit and work.